Are water and food carrying tubes found only in stems?

No, water and food-carrying tubes are not found only in stems. In vascular plants, xylem transports water and minerals, while phloem carries nutrients and food, and these tissues are present in stems, roots, and leaves. Roots have xylem and phloem to absorb water and nutrients from the soil and distribute them throughout the plant. Similarly, leaves contain vascular tissues to facilitate the transport of photosynthesized sugars.